The amount of fulfilment fee payable or due to affiliates.

No definition available.

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Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represent fees for services the company performs on behalf of PMT in connection with the acquisition, packaging and sale of mortgage loans.

+ References

No definition available.

+ Details

Name:	pfsi_LoanFulfillmentFeesReceivableFromAffiliate
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of maximum multiplier factor for each pull through adjusted loan commitment.

+ References

No definition available.

+ Details

Name:	pfsi_MaximumMultiplyingFactorForEachPullThroughAdjustedLoanCommitment
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the recapture expense incurred relating to mortgage loans subject to either MSRs or ESS owned by a related party that were refinanced by the Company.

+ References

No definition available.

+ Details

Name:	pfsi_MortgageServicingRightsMSRsRecaptureRecognized
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Multiplying factor for each pull through adjusted loan commitment in excess of threshold limit per quarter.

+ References

No definition available.

+ Details

Name:	pfsi_MultiplyingFactorForEachPullThroughAdjustedLoanCommitmentInExcessOfThresholdLimitPerQuarter
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Multiplying factor for number of purchased loans.

+ References

No definition available.

+ Details

Name:	pfsi_MultiplyingFactorForNumberOfPurchasedLoans
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of Multiplying factor for number of purchased loans in excess of threshold limit per quarter.

+ References

No definition available.

+ Details

Name:	pfsi_MultiplyingFactorForNumberOfPurchasedLoansInExcessOfThresholdLimitPerQuarter
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the net gains from sale of mortgage loans to related party.

+ References

No definition available.

+ Details

Name:	pfsi_NetGainsFromSaleOfMortgageLoansToRelatedParty
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of fair market value.

+ References

No definition available.

+ Details

Name:	pfsi_PercentageOfFairMarketValue
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of recapture rate.

+ References

No definition available.

+ Details

Name:	pfsi_PercentageOfRecaptureRate
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflows resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

+ References

No definition available.

+ Details

Name:	pfsi_ProceedFromSaleOfMortgageLoansHeldForSale
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Pull through factor as a percentage.

+ References

No definition available.

+ Details

Name:	pfsi_PullThroughFactorAsPercentage
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsLendingActivityAbstract
Namespace Prefix:	pfsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents a fee paid to a related party relating to mortgage loans purchased from the related party through its correspondent lending activities.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsSourcingFeesPaid
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents a percentage of related party fees relating to mortgage loans purchased from the related party through its correspondent lending activities.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsSourcingFeesPercentage
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the tax service fee receivable from transactions with related parties.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsTaxServiceFeeReceivable
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the unpaid principal balance of loans fulfilled.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansFulfilled
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents unpaid principal balance of loans purchased.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansPurchased
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents unpaid principal balance of loans purchased conventional conforming.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansPurchasedConventionalConforming
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents unpaid principal balance of loans purchased government guaranteed or insured.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansPurchasedGovernmentGuaranteedOrInsured
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of target recapture date

+ References

No definition available.

+ Details

Name:	pfsi_TargetRecaptureRate
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of threshold limit for loan commitment per quarter.

+ References

No definition available.

+ Details

Name:	pfsi_ThresholdLimitOfLoanCommitmentPerQuarter
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=pfsi_GinnieMaeMortgageBackedSecuritiesGuideLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=pfsi_OtherMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_MortgageServicingRightsRecaptureAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=pfsi_RecaptureRateUpto15PercentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=pfsi_RecaptureRateInExcessOf15PercentageAndUpto30PercentageMember
Namespace Prefix:
Data Type:	na
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- Details

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Data Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_MortgageLendingAgreementMember
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Related Party Transactions - Correspondent Production (Details) - USD ($)		3 Months Ended
	Jul. 01, 2020	Mar. 31, 2023	Mar. 31, 2022
Lending activity between the entity and affiliate
Net gains on loans held for sale at fair value		$ (104,385,000)	$ (298,459,000)
Sales of loans held for sale to PMT			259,038,000
Fulfillment fee revenue		11,923,000	16,754,000
Ginnie Mae Mortgage Backed Securities Guide Loan
Transactions with Affiliates
Threshold limit of loan commitment	$ 16,500
Maximum Multiplier factor for each pull through adjusted loan commitment	585
Multiplying factor for each pull through adjusted loan commitment in excess of threshold limit per quarter	355
Multiplying factor for number of purchased loans	315
Multiplying factor for number of purchased loans in excess of threshold limit per quarter	$ 195
Ginnie Mae Mortgage Backed Securities Guide Loan \| Minimum
Transactions with Affiliates
Pull through factor as a percentage	80.00%
Ginnie Mae Mortgage Backed Securities Guide Loan \| Maximum
Transactions with Affiliates
Pull through factor as a percentage	99.00%
Other mortgage loans
Transactions with Affiliates
Multiplying factor for number of purchased loans	$ 750
MSR Recapture Agreement
Transactions with Affiliates
Target recapture rate	15.00%
MSR Recapture Agreement \| First 15%
Transactions with Affiliates
Percentage of fair market value.	40.00%
Percentage of recapture rate.	15.00%
MSR Recapture Agreement \| In excess of 15% and upto 30%
Transactions with Affiliates
Percentage of fair market value.	35.00%
MSR Recapture Agreement \| In excess of 15% and upto 30% \| Minimum
Transactions with Affiliates
Percentage of recapture rate.	15.00%
MSR Recapture Agreement \| In excess of 15% and upto 30% \| Maximum
Transactions with Affiliates
Percentage of recapture rate.	30.00%
MSR Recapture Agreement \| In excess of 30%
Transactions with Affiliates
Percentage of fair market value.	30.00%
Percentage of recapture rate.	30.00%
PennyMac Mortgage Investment Trust
Lending activity between the entity and affiliate
Net gains on loans held for sale at fair value		485,000	9,652,000
PennyMac Mortgage Investment Trust \| Mortgage Lending
Lending activity between the entity and affiliate
Net losses on loans sold to PMT (primarily cash)			(1,391,000)
Mortgage servicing rights and excess servicing spread recapture incurred		(485,000)	(8,261,000)
Net gains on loans held for sale at fair value		(485,000)	(9,652,000)
Sales of loans held for sale to PMT			259,038,000
Tax service fee		1,410,000	2,342,000
Fulfillment fee revenue		11,923,000	16,754,000
Unpaid principal balance of loans fulfilled for PMT		6,628,810,000	9,769,262,000
Sourcing fees paid		1,328,000	1,296,000
Government guaranteed or insured		9,213,712,000	12,747,779,000
Conventional conforming		4,062,874,000
Unpaid principal balance of loans purchased from PMT		$ 13,276,586,000	$ 12,747,779,000
PLS \| Minimum
Transactions with Affiliates
Sourcing fees (as a percent)	0.01%
PLS \| Maximum
Transactions with Affiliates
Sourcing fees (as a percent)	0.02%
PLS \| Ginnie Mae Mortgage Backed Securities Guide Loan
Transactions with Affiliates
Fulfilment fee payable	$ 0